From mboxrd@z Thu Jan  1 00:00:00 1970
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Date: Wed, 28 Sep 2016 16:20:41 +0200
From: cinap_lenrek@felloff.net
To: 9front@9front.org
Subject: Re: [9front] Middle button on usb mice
In-Reply-To: <20160928021342.GA2003@speakerbox>
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X-Bullshit: asynchronous service component cloud information-scale database 

in fact, you might try this (untested):

diff -r 38db1b2cd29e sys/src/cmd/nusb/kb/kb.c
--- a/sys/src/cmd/nusb/kb/kb.c	Thu Sep 22 11:04:43 2016 +0200
+++ b/sys/src/cmd/nusb/kb/kb.c	Wed Sep 28 16:20:13 2016 +0200
@@ -234,8 +234,7 @@
 					for(i=l[UsagMin]; i<=l[UsagMax] && l[UsgCnt] < Nu; i++)
 						l[Nl + l[UsgCnt]++] = i;
 				for(i=0; i<g[RepCnt]; i++){
-					if(i < l[UsgCnt])
-						l[Usage] = l[Nl + i];
+					l[Usage] = i < l[UsgCnt] ? l[Nl + i] : 0;
 					(*f)(t, v, g, l, c, a);
 				}
 				break;

--
cinap